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Interestingly in Dubai International Airport, they have these smart gates that recognize you and re-issue your re-entry eVisa using facial recognition. You walk up, they scan your face and show your name.

No passport gets scanned.

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This is a convenience that will turn into an absolute nightmare for average citizens in a few years time. Imagine saying something the state doesn't like and suddenly half the doors in the country won't open for you.

Major US airports have this too for boarding international flights.

For what it’s worth I’ve had no trouble opting out. A polite but firm request to the gate agent did the trick:

“I prefer not to have my face scanned. Will you scan my boarding pass?”

I have also opted out of body scans for TSA (before I pony’d up for Pre-Check) and out of their facial recognition check at Boston Logan.

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